Update to version 0.39.0 major upstream release. (forwarded request 1080214 from luc14n0)

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- All those completion scripts not requiring their respective
  shells is a bit ridiculous.

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- Update to 0.37.0:
  - Added a way to customize the separator of inline info
    fzf --info 'inline: ╱ ' --prompt '╱ ' --color prompt:bright-yellow
  - New event
        focus - Triggered when the focus changes due to a vertical cursor
        movement or a search result update
        fzf --bind 'focus:transform-preview-label:echo [ {} ]' --preview 'cat {}'
        # Any action bound to the event runs synchronously and thus can make the interface sluggish
        # e.g. lolcat isn't one of the fastest programs, and every cursor movement in
        #      fzf will be noticeably affected by its execution time
        fzf --bind 'focus:transform-preview-label:echo [ {} ] | lolcat -f' --preview 'cat {}'
        # Beware not to introduce an infinite loop
        seq 10 | fzf --bind 'focus:up' --cycle
    - New actions
        change-border-label
        change-preview-label
        transform-border-label
        transform-preview-label
    - Bug fixes and improvements
- Update to 0.36.0:
  - Added --listen=HTTP_PORT option to start HTTP server. It allows external
    processes to send actions to perform via POST method.
    # Start HTTP server on port 6266
    fzf --listen 6266
    # Send actions to the server
    curl localhost:6266 -d 'reload(seq 100)+change-prompt(hundred> )'
  - Added draggable scrollbar to the main search window and the preview window
    # Hide scrollbar
    fzf --no-scrollbar
    # Customize scrollbar
    fzf --scrollbar ┆ --color scrollbar:blue
  - New event
        Added load event that is triggered when the input stream is complete
        and the initial processing of the list is complete.
        # Change the prompt to "loaded" when the input stream is complete
        (seq 10; sleep 1; seq 11 20) | fzf --prompt 'Loading> ' --bind 'load:change-prompt:Loaded> '
        # You can use it instead of 'start' event without `--sync` if asynchronous
        # trigger is not an issue.
        (seq 10; sleep 1; seq 11 20) | fzf --bind 'load:last'
  - New actions
        Added pos(...) action to move the cursor to the numeric position
            first and last are equivalent to pos(1) and pos(-1) respectively
        # Put the cursor on the 10th item
        seq 100 | fzf --sync --bind 'start:pos(10)'
        # Put the cursor on the 10th to last item
        seq 100 | fzf --sync --bind 'start:pos(-10)'
        Added reload-sync(...) action which replaces the current list only after
        the reload process is complete. This is useful when the command takes
        a while to produce the initial output and you don't want fzf to run against
        an empty list while the command is running.
        # You can still filter and select entries from the initial list for 3 seconds
        seq 100 | fzf --bind 'load:reload-sync(sleep 3; seq 1000)+unbind(load)'
        Added next-selected and prev-selected actions to move between selected
        items
        # `next-selected` will move the pointer to the next selected item below the current line
        # `prev-selected` will move the pointer to the previous selected item above the current line
        seq 10 | fzf --multi --bind ctrl-n:next-selected,ctrl-p:prev-selected
        # Both actions respect --layout option
        seq 10 | fzf --multi --bind ctrl-n:next-selected,ctrl-p:prev-selected --layout reverse
        Added change-query(...) action that simply changes the query string to the
        given static string. This can be useful when used with --listen.
        curl localhost:6266 -d "change-query:$(date)"
        Added transform-prompt(...) action for transforming the prompt string
        using an external command
        # Press space to change the prompt string using an external command
        # (only the first line of the output is taken)
        fzf --bind 'space:reload(ls),load:transform-prompt(printf "%s> " "$(date)")'
        Added transform-query(...) action for transforming the query string using
        an external command
        # Press space to convert the query to uppercase letters
        fzf --bind 'space:transform-query(tr "[:lower:]" "[:upper:]" <<< {q})'
        # Bind it to 'change' event for automatic conversion
        fzf --bind 'change:transform-query(tr "[:lower:]" "[:upper:]" <<< {q})'
        # Can only type numbers
        fzf --bind 'change:transform-query(sed "s/[^0-9]//g" <<< {q})'
        put action can optionally take an argument string
        # a will put 'alpha' on the prompt, ctrl-b will put 'bravo'
        fzf --bind 'a:put+put(lpha),ctrl-b:put(bravo)'
    - Added color name preview-label for --preview-label
      (defaults to label for --border-label)
    - Better support for (Windows) terminals where
      each box-drawing character takes 2 columns. Set
      RUNEWIDTH_EASTASIAN environment variable to 1.
        On Vim, the variable will be automatically set if &ambiwidth is double
    - Behavior changes
        fzf will always execute the preview command if the command template
        contains {q} even when it's empty. If you prefer the old behavior,
        you'll have to check if {q} is empty in your command.
        # This will show // even when the query is empty
        : | fzf --preview 'echo /{q}/'
        # But if you don't want it,
        : | fzf --preview '[ -n {q} ] || exit; echo /{q}/'
        double-click will behave the same as enter unless otherwise specified,
        so you don't have to repeat the same action twice in --bind in most cases.
        # No need to bind 'double-click' to the same action
        fzf --bind 'enter:execute:less {}' # --bind 'double-click:execute:less {}'
        If the color for separator is not specified, it will default to the
        color for border. Same holds true for scrollbar. This is to reduce
        the number of configuration items required to achieve a consistent color
        scheme.
        If follow flag is specified in --preview-window option, fzf will
        automatically scroll to the bottom of the streaming preview output. But
        when the user manually scrolls the window, the following stops. With
        this version, fzf will resume following if the user scrolls the window
        to the bottom.
        Default border style on Windows is changed to sharp because some
        Windows terminals are not capable of displaying rounded border
        characters correctly.
    - Minor bug fixes and improvements

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- Update to 0.34.0:
  - Added support for adaptive --height. If the --height value is prefixed
    with ~, fzf will automatically determine the height in the range according
    to the input size.
    seq 1 | fzf --height ~70% --border --padding 1 --margin 1
    seq 10 | fzf --height ~70% --border --padding 1 --margin 1
    seq 100 | fzf --height ~70% --border --padding 1 --margin 1
      - There are a few limitations
        - Not compatible with percent top/bottom margin/padding
            # This is not allowed (top/bottom margin in percent value)
            fzf --height ~50% --border --margin 5%,10%
            # This is allowed (top/bottom margin in fixed value)
            fzf --height ~50% --border --margin 2,10%
         - fzf will not start until it can determine the right height for the input
            # fzf will open immediately
            (sleep 2; seq 10) | fzf --height 50%
            # fzf will open after 2 seconds
            (sleep 2; seq 10) | fzf --height ~50%
            (sleep 2; seq 1000) | fzf --height ~50%
  - Fixed tcell renderer used to render full-screen fzf on Windows
    --no-clear is deprecated. Use reload action instead.

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- Update to 0.27.3:
  - Preview window is `hidden` by default when there are `preview` bindings but
    `--preview` command is not given
  - Fixed bug where `{n}` is not properly reset on `reload`
  - Fixed bug where spinner is not displayed on `reload`
  - Enhancements in tcell renderer for Windows (#2616)
  - Vim plugin
      - `sinklist` is added as a synonym to `sink*` so that it's
        easier to add a function to a spec dictionary
        ```vim
        let spec = { 'source': 'ls', 'options': ['--multi', '--preview', 'cat {}'] }
        function spec.sinklist(matches)
          echom string(a:matches)
        endfunction
  
        call fzf#run(fzf#wrap(spec))
        ```
  - Vim 7 compatibility
- Set FZF_VERSION and FZF_REVISION environment variables as well.

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- Update to 0.27.2:
  - 16 base ANSI colors can be specified by their names
    fzf --color fg:3,fg+:11
    fzf --color fg:yellow,fg+:bright-yellow
  - Fix bug where --read0 not properly displaying long lines

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- Update to 0.27.1:
  - Added unbind action. In the following Ripgrep launcher
    example, you can use unbind(reload) to switch to fzf-only
    filtering mode.
    See https://github.com/junegunn/fzf/blob/master/ADVANCED.md#switching-to-fzf-only-search-mode
  - Vim plugin will stop immediately even when the source command hasn't finished
    " fzf will read the stream file while allowing other processes to append to it
    call fzf#run(fzf#wrap({'source': 'cat /dev/null > /tmp/stream; tail -f /tmp/stream'}))
  - It is now possible to open popup window relative to the currrent window
    let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6, 'relative': v:true, 'yoffset': 1.0 } }

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- Update to 0.26.0:
  - Added support for fixed header in preview window
    # Display top 3 lines as the fixed header
    fzf --preview 'bat --style=header,grid --color=always {}' --preview-window '~3'
    More advanced preview offset expression to better support the fixed header
    # Preview with bat, matching line in the middle of the window below
    # the fixed header of the top 3 lines
    #
    #   ~3    Top 3 lines as the fixed header
    #   +{2}  Base scroll offset extracted from the second field
    #   +3    Extra offset to compensate for the 3-line header
    #   /2    Put in the middle of the preview area
    #
    git grep --line-number '' |
      fzf --delimiter : \
          --preview 'bat --style=full --color=always --highlight-line {2} {1}' \
          --preview-window '~3:+{2}+3/2'
  - Added select and deselect action for unconditionally selecting or
    deselecting a single item in --multi mode. Complements toggle action.
  - Sigificant performance improvement in ANSI code processing
  - Bug fixes and improvements

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- Update to 0.25.1:
  - Added `close` action
    - Close preview window if open, abort fzf otherwise
  - Bug fixes and improvements

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- Text attributes set in --color are not reset when fzf sees another
  --color option for the same element. This allows you to put custom
  text attributes in your $FZF_DEFAULT_OPTS and still have those
  attributes even when you override the colors.
  # Default colors and attributes
  fzf
  # Apply custom text attributes
  export FZF_DEFAULT_OPTS='--color fg+:italic,hl:-1:underline,hl+:-1:reverse:underline'
  fzf
  # Different colors but you still have the attributes
  fzf --color hl:176,hl+:177
  # Write "regular" if you want to clear the attributes
  fzf --color hl:176:regular,hl+:177:regular
- Renamed --phony to --disabled
- You can dynamically enable and disable the search functionality using
  the new enable-search, disable-search, and toggle-search actions
- You can assign a different color to the query string for when search
  is disabled
  fzf --color query:#ffffff,disabled:#999999 --bind space:toggle-search
- Added last action to move the cursor to the last match
      The opposite action top is renamed to first, but top is still
      recognized as a synonym for backward compatibility
- Added preview-top and preview-bottom actions
- Extended support for alt key chords: alt with any case-sensitive
  single character
  fzf --bind alt-,:first,alt-.:last
- Generate tags for vim documentation

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